MAINTAINERS: Add entry for MediaTek IOMMU

I am the author of MediaTek iommu driver, and will to maintain and
develop it further.
Add myself to cover these items.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Reviewed-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Link: https://lore.kernel.org/r/20210111111914.22211-34-yong.wu@mediatek.com
Signed-off-by: Will Deacon <will@kernel.org>

Author: YongWu-HF

MAINTAINERS

@@ -11182,6 +11182,15 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt
 F:	drivers/i2c/busses/i2c-mt65xx.c
 
+MEDIATEK IOMMU DRIVER
+M:	Yong Wu <yong.wu@mediatek.com>
+L:	iommu@lists.linux-foundation.org
+L:	linux-mediatek@lists.infradead.org (moderated for non-subscribers)
+S:	Supported
+F:	Documentation/devicetree/bindings/iommu/mediatek*
+F:	drivers/iommu/mtk-iommu*
+F:	include/dt-bindings/memory/mt*-port.h
+
 MEDIATEK JPEG DRIVER
 M:	Rick Chang <rick.chang@mediatek.com>
 M:	Bin Liu <bin.liu@mediatek.com>